<template>
    <div class="star" :class="starType">
      <span v-for="(itemClass,index) of itemClass" :key="index" class="star-item" :class="itemClass"></span>
    </div>
</template>
<script>
const length = 5
const on = 'on'
const half = 'half'
const off = 'off'
export default {
  name: 'Star',
  props: {
    size: Number,
    score: Number
  },
  computed: {
    starType () {
      return 'star-' + this.size
    },
    itemClass () {
      let result = []
      let score = Math.floor(this.score * 2) / 2
      let hasDecimal = score % 1 !== 0
      let integer = Math.floor(score)
      for (let i = 0; i < integer; i++) {
        result.push(on)
      }
      if (hasDecimal) {
        result.push(half)
      }
      if (result.length < length) {
        result.push(off)
      }
      return result
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import "../../../src/assets/stylus/mixin.styl"
  .star
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')
</style>
